re:Post User is linked to the IAM credentials.
Therefore, the root account and each IAM user are recognised as different users on re:Post, even if they are under the same AWS account.
I have encountered similar problems before and eventually contacted AWS Support to resolve them.
In this case, I assume that the re:Post profile created by the root account credentials will be associated to a new re:Post user internaly by AWS support.
Please also refer to this previous answer.
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